libc6-dev but it is not going to be installed or libc-dev

These two packages, `libc6-dev` and `libc-dev`, are both related to the C standard library on Linux systems. `libc6-dev` is the development files for the GNU C Library, while `libc-dev` is a virtual package that depends on the appropriate C library development files for the current system.

If you see the message "libc6-dev but it is not going to be installed" or "libc-dev", it means that the package manager is unable to install the required package. This could be due to a variety of reasons, such as missing dependencies, conflicting packages, or an outdated package index.

To resolve this issue, you can try the following steps:

1. Update the package index of your system by running `sudo apt update` command.
2. Install the missing dependencies by running `sudo apt install -f` command.
3. Try to install the `libc6-dev` package again by running `sudo apt install libc6-dev` command.

If none of these steps work, you can try searching for alternative packages or seeking help from the package maintainers or community forums.